Abstract

The problem of designing and standardizing tests of scotopic vision for military purposes has claimed much attention. The light sensitivity tests (used in studies of avitaminosis) were discarded in the early 40’s in favor of form perception tests for the armed forces, but the relation of the two types of tests remains a matter of scientific interest. By means of a supplementary form-target device designed for use in the Hecht-Shlaer (research) adaptometer, data were collected on trained adult subjects for both light and form thresholds with 3° targets. Results are presented and analyzed for dark-adapted cone vision and rod vision, separately. Data are given showing the differing amounts and character of luminance necessary for cones and rods and for light versus perception of form (T) orientation. The close correspondence of these experimental findings to some results of recently released military research is shown, and the relation of these results to current visual theory on the stimulus characteristics of the retina are discussed.

© 1953 Optical Society of America

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